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Energy generator

royston02

This idea was in me for a long time. I know that when stepper motors are rotated, they generate electricity. However they are big and bulky. Which is the smallest thing that generates electricity in oscillatory motion(like stepper motors)?

Minimum amperage - 100-125ma.  Minimum voltage - 5V or high(AC/DC).

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  • in reply to royston02

    If you rotate the shaft of a regular DC motor then it will generate ac electricity. It is like the reverse of driving it. Trust me, it works. With some gearing to increase the speed of rotation they can generate quite a lot of power. I wanted to know how fast you will be turning the shaft to work out the amount of electricity generated.

  • in reply to kidiccurus

    The speed of walking is the speed of the shaft and in oscillatory motion.

    Check out the other one for proper explanation.

  • in reply to royston02

    The most efficient readily available device to convert mechanical energy into electrical energy is almost certainly a  good quality DC permanent magnet servo motor. One using rare earth magnets will be smaller. The problem of extracting mechanical energy from someone walking is up to you to solve - there have been many attempts but they have not been very successful - it seems that you can extract very small amounts of energy without too much inconvenience to the walker but that the mechanisms get very complex if the device is to be built into a shoe or attached to a leg. I can't really imagine a swinging weight being very comfortable.

    In designing a practical device you might decide to trade off some efficiency against making the design simpler.

     

    MK